Maria Sharapova looked like a champion under the Centre Court roof at Wimbledon, advancing to the semifinals at the All England Club four the fourth time with a 6-1, 6-1 win over Dominika Cibulkova on Tuesday.

If Serena Williams routinely hits shots that make you ooh and aah, Caroline Wozniacki routinely chases down shots like that. The current No. 1 plays a less forceful version of the sport than former No. 1s such as Williams or Maria Sharapova. While they pride themselves on offense, the 20-year-old Wozniacki relies more on defense, using her movement and court sense until she can end the point with a winner or, more likely, until her exhausted and flummoxed opponent makes an error.